Tool



Patented Oct. 14, 1924.

UNITED STATES PATENT opEFl-CE.

VICTOR YNGVE, OF SOUTH ORANGE, NEW JERSEY, ASSIGNOR T0 MANHATTAN ELEC-TRICAL SUPPLY COMPANY, INC., OF NEW YORK, N. Y., A CORPORATION 0F MASSA-CH'USETTS.

A TOOL.

Application led December 5, 1923. Serial No. 678,553.

To all whom t may con-cem:

Be it known that I, VIC/ron YNGVE, a citizen of the United States,residing at South Orange, in the county of Essex and State of NewJersey, United States of America, having invented certain new and usefulImprovements in rPools, do hereby declare that the following is a full,clear, and exact description of the same.

` This invention relates to tools and more particularly to forming toolsor dies such as are used in molding, drawing, etc., a large variety ofarticles.

As well known, toolsy such as punches,

dies, etc., for treating materials of inherent,

rigidity such as metals, ores, carbon and oth er substance, comminutedor solid, which retains its shape until aHected by a tool, are made ofreadily malleable metals that are sufliciently hard and smooth towithstand abrasion and Wear generally thus to prevent the marring of thearticles to be manufactured. Steel lends itself best for this purpose;it is hard, malleable and'takes a high polish. In difficult drawingoperations dies of great hardness are often required. In

\ certain .cases non-malleable material must be used that has to beground to the desired shape because even hard steel dies would be marredto such an extent that after a few operations it would be necessary todiscard them. In dies and punches for tablet or briquette makingmachines it was necessary to exercise the greatest care in selectingsteel of properI hardness and finish. Notwithstanding this, such dieswere worn out after a. few days or hours of use necessitating not onlythe replacement of an expensive tool, but also the costly stoppage ofthe manufacturing process.

As above indicated, materials ,of great hardness, tensile strength,etc., were sought and in certain cases materials (e. g., steelite) wereselected which could not be forced into shape. Obviously, all this addedgreatly to the cost of manufacturing and in certain cases no metals wereavailable for the construction of commercially practicable dies.Applicant has found, for instance, that in -tablet or briquette makingmachines dies even of the hardest steel available were worn out veryrapidly and in casesvwhen thek tablet or briquette mixture containedhard, gritty substances (ores, carbon, me-

ing material which is preferably applied by means of an electro-platingprocess.

Metallic chromium has been found particularly advantageous for thispurpose. Chromium is exceedingly hard, holds its bright, silver-likeluster and resists corrosion almost indefinitely. The die is preferablyelectroplated (steel does not lose its temper during chromium plating),and best results are obtained by using `Sargents solution containing 245g/L chromic acid and 3 g/L chromium sulphate, and a current density of13.4 amp/sq. dm. (125 amp. sq..

ft), using a chromium anode. In a tablet or' briquette molding operationin which steel dies were discarded after a few hours of use, steel diesof the same quality when plated in the above described manner remainedin use for a week or more and not even a microscopic examinationrevealed.

any corrosion or abrasion.

What I claim is:

l. As a new article vof manufacture. steel forming tool, the wearingsurface of which is coated with metallic chromium.

2. As a new article of manufacture, a forming tool for shaping materialof inherent rigidity consisting of relatively soft metal electroplatedon its wearing surface with a layer of chromium.

3. As afnew article of manufacture, steel briquette molding punches anddies, the wearing surfaces of which are electroplated with metallicchromium.

4. As a new article of manufacture, a tool forcompacting comminutedmaterials the wearing surfaces of said tool beingelectroplated withmetallic chromium.

5. As a new article of manufacture, a chromium plated compacting die.

In witness whereof, I hereunto subscribe my name this 4th day ofDecember, 1923.

` W j VICTOR YNGV'E.

